invariable

/ɪnˈvɛɹ.i.ə.bl̩/

//ɪnˈvɛɹ.i.ə.bl̩// adj

By · According to Wiktionary data (CC BY-SA) ·

"invariable" is a 10-letter English headword indexed on PlainSpell.

The verdict

“invariable” is uncommon English (frequency #79,636 among 2,140 “I” headwords), classed as an adjective. The kind of spelling people second-guess.

#79,636
frequency rank, English
2,140
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not variable; unalterable; uniform; always having the same value.

Corpus desk

Index EN-invariable · invariable · English

invariable · rank #79,636 · 0 variants · 0 confusables

  • FREQ-RARE #79,636
  • LEN-MEGA 10 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH intervertebral

Nearest frequency peer: intervertebral (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “invariable”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “invariable” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for invariable
PropertyValue
Headwordinvariable
LanguageEnglish
Part of speechAdjective
IPA/ɪnˈvɛɹ.i.ə.bl̩/
Letters10
Frequency rank#79,636
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “invariable” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).invariablefalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “intervertebral” (#79,635), “intermingling” (#79,633), “intercellular” (#79,632). Among 2,140 “I” headwords, “invariable” is #79,636. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

invariable is uncommon English at frequency #79,636 among 2,140 “I” headwords, classed as anadjective, transcribed /ɪnˈvɛɹ.i.ə.bl̩/. Rarity is why readers land here mid-draft. 3 senses are on record.

invariable doesn't appear in our generated misspelling index, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From in- + variable. The correct English form is invariable, spelled I-N-V-A-R-I-A-B-L-E.

Definition

  1. 1
    Not variable; unalterable; uniform; always having the same value.
  2. 2
    Constant.
  3. 3
    That cannot undergo inflection, conjugation or declension.

Recorded use

Wiktionary examples

These source excerpts show how invariable appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Physical laws which are invariable.
  2. “A tight little craft,” was Austin’s invariable comment on the matron; and she looked it, always trim and trig and smooth of surface like a converted yacht cleared for action.

Etymology

From in- + variable.

This word in other languages

invariable(Español)invariable(Français)unveränderlich(Deutsch)invariável(Português)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "invariable"?
"invariable" is spelled I-N-V-A-R-I-A-B-L-E. The IPA pronunciation is /ɪnˈvɛɹ.i.ə.bl̩/.
What does "invariable" mean?
As an adjective, "invariable" means: Not variable; unalterable; uniform; always having the same value.
How do you pronounce "invariable"?
The IPA (International Phonetic Alphabet) transcription for "invariable" is /ɪnˈvɛɹ.i.ə.bl̩/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "invariable"?
From in- + variable. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "invariable", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 10 letters (nearest by frequency rank).

idolatrous#79,616iconoclast#79,615hypervisor#79,610humbleness#79,605

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list